dsPIC33F之True Independent PWM output

/***************************************************************************************  ?2008 Microchip Technology Inc.                                         *                                                                           *  FileName:              True Independent PWM Output.c                                    *  Dependencies:          Header (.h) files if applicable, see below        *  Processor:             dsPIC33FJ64GS610                                  *  Compiler:              MPLAB?C30 v3.02 or higher                        *  IDE:                   MPLAB?IDE v8.36.02 or later                         *  Hardware Dependencies: explorer 16 Board             *                                                                           *  SOFTWARE LICENSE AGREEMENT:                                              * Microchip Technology Incorporated ("Microchip") retains all ownership and * intellectual property rights in the code accompanying this message and in all * derivatives hereto.  You may use this code, and any derivatives created by * any person or entity by or on your behalf, exclusively with Microchip's* proprietary products.  Your acceptance and/or use of this code constitutes * agreement to the terms and conditions of this notice.** CODE ACCOMPANYING THIS MESSAGE IS SUPPLIED BY MICROCHIP "AS IS".  NO * WARRANTIES, WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT NOT LIMITED * TO, IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND FITNESS FOR A * PARTICULAR PURPOSE APPLY TO THIS CODE, ITS INTERACTION WITH MICROCHIP'S * PRODUCTS, COMBINATION WITH ANY OTHER PRODUCTS, OR USE IN ANY APPLICATION. ** YOU ACKNOWLEDGE AND AGREE THAT, IN NO EVENT, SHALL MICROCHIP BE LIABLE, WHETHER * IN CONTRACT, WARRANTY, TORT (INCLUDING NEGLIGENCE OR BREACH OF STATUTORY DUTY), * STRICT LIABILITY, INDEMNITY, CONTRIBUTION, OR OTHERWISE, FOR ANY INDIRECT, SPECIAL, * PUNITIVE, EXEMPLARY, INCIDENTAL OR CONSEQUENTIAL LOSS, DAMAGE, FOR COST OR EXPENSE OF * ANY KIND WHATSOEVER RELATED TO THE CODE, HOWSOEVER CAUSED, EVEN IF MICROCHIP HAS BEEN * ADVISED OF THE POSSIBILITY OR THE DAMAGES ARE FORESEEABLE.  TO THE FULLEST EXTENT * ALLOWABLE BY LAW, MICROCHIP'S TOTAL LIABILITY ON ALL CLAIMS IN ANY WAY RELATED TO * THIS CODE, SHALL NOT EXCEED THE PRICE YOU PAID DIRECTLY TO MICROCHIP SPECIFICALLY TO * HAVE THIS CODE DEVELOPED.** You agree that you are solely responsible for testing the code and * determining its suitability.  Microchip has no obligation to modify, test, * certify, or support the code.*                                                                         ****************************************************************************** Description:                                                              **   This program illustrates the use of the PWM module in the true ** independent output mode. PWM1H and PWM1L have different switching ** frequencies but the same duty cycle (50% of switching period).**                                                                           *                *****************************************************************************/#include "p33FJ64GS610.h"/* Configuration Bit Settings */_FOSCSEL(FNOSC_FRC)_FOSC(FCKSM_CSECMD & OSCIOFNC_ON)_FWDT(FWDTEN_OFF)_FPOR(FPWRT_PWR128)_FICD(ICS_PGD1 & JTAGEN_OFF)void init_PWM(void);int main(){/* Configure Oscillator to operate the device at 40Mhz   Fosc= Fin*M/(N1*N2), Fcy=Fosc/2    Fosc= 7.37*(43)/(2*2)=80Mhz for Fosc, Fcy = 40Mhz *//* Configure PLL prescaler, PLL postscaler, PLL divisor */PLLFBD=41; /* M = PLLFBD + 2 */CLKDIVbits.PLLPOST=0;   /* N1 = 2 */CLKDIVbits.PLLPRE=0;    /* N2 = 2 */    __builtin_write_OSCCONH(0x01);/* New Oscillator FRC w/ PLL */    __builtin_write_OSCCONL(0x01);  /* Enable Switch */      while(OSCCONbits.COSC != 0b001);/* Wait for new Oscillator to become FRC w/ PLL */      while(OSCCONbits.LOCK != 1);/* Wait for Pll to Lock *//* Now setup the ADC and PWM clock for 120MHz   ((FRC * 16) / APSTSCLR ) = (7.37 * 16) / 1 = ~ 120MHz*/ACLKCONbits.FRCSEL = 1;/* FRC provides input for Auxiliary PLL (x16) */ACLKCONbits.SELACLK = 1;/* Auxiliary Oscillator provides clock source for PWM & ADC */ACLKCONbits.APSTSCLR = 7;/* Divide Auxiliary clock by 1 */ACLKCONbits.ENAPLL = 1;/* Enable Auxiliary PLL */while(ACLKCONbits.APLLCK != 1);/* Wait for Auxiliary PLL to Lock */    init_PWM();        while(1);                     /* Infinite Loop */}void init_PWM(){    PHASE1 = 1920;                          /* PWM1H, PHASEx = ((1 / 500kHz) / 1.04ns) = 1923, where 500kHz  is the desired switching frequency and 1.04ns is PWM resolution. */    SPHASE1 = 3840;                         /* PWM1L, SPHASEx = ((1 / 250kHz) / 1.04ns) = 3846, where 250kHz  is the desired switching frequency and 1.04ns is PWM resolution. */PWMCON1bits.ITB = 1;/* Use Phasex and SPHASEx registers for Independent time base */PWMCON1bits.DTC = 2;/* Disable Deadtime */       IOCON1bits.PENH = 1;      /* PWM1H is controlled by PWM module */     IOCON1bits.PENL = 1;      /* PWM1L is controlled by PWM module */    IOCON1bits.PMOD = 3;      /* Select True Independent Output PWM mode */    PDC1 = 960;   /* 50% Duty cycle for PWM1H */ SDC1 = 1920;/* 50% Duty cycle for PWM1L */        PTCONbits.PTEN       = 1;      /* Enable the PWM Module */}